Implement bidirectional routing

[dryewo]

Sometimes it's necessary to generate a resource URL from a handler function, for example, to provide "location" header. Concatenating strings is not an ideal solution. We can possibly support it by using vendor extension parameter in the spec:

  '/hello/{name}':
    x-path-id: hello-name
    get:
      summary: Gets hello

After this it should be possible to call a function to create a URL:

(path-for (:swagger request) :hello-name "Michael")

Challenges:

• need to support path parameters for routes
• need to patch swagger1st to allow vendor extensions on this level
• (:swagger request) - is it the best way to access the routing information?

Good existing solution: https://github.com/juxt/bidi